The IWG-MRT is a non-for-profit scientific organization focused on Philadelphia chromosome-negative myeloproliferative neoplasms. The group includes clinicans, pathologists and laboratory scientists with proven track record of contributions to the field. The board is chaired by Prof. Ayalew Tefferi from the Mayo Clinic, Rochester (USA). A complete list of IWG-MRT investigators, as well as information about its activities, can be found at MDPInfo. The targets of the group are the scientific and clinic community in this field of hematology, without any connection with, or sponsorship from, the pharmaceutical industry, and more in general the whole community of patients with MPN.